Tim Ferriss has addressed FTC rules very well. What he wrote applies perfectly to this website so we've quoted him below.

"Per the FTC rules, if I interview someone and they grab the bill for lunch, I would need to disclose this. Ditto if I use an Amazon link that gets me 8 cents instead of an Amazon link that gets me 0 cents. If someone gives me a comfy t-shirt with a logo and I wear it in a photo, same deal. Disclaimers all over the place. This would be tedious for me and even more tedious for readers. But rules is rules. To cover my ass and preserve your reading experience, please assume that, for every link and product I use, the following all hold true:"